Hydrogen production from formic acid (FA) as an organic liquid hydrogen carrier has been receiving increased attention.[1] Toward practical use, robust catalysts are required for continuous and constant hydrogen production. We describe that robust and efficient iridium catalysts with pyridylpyrazole ligands for FA dehydrogenation in water.[2]<br/>In order to evaluate the durability of catalysts, FA dehydrogenation was carried out under reflux conditions (bath temp. 110 °C) in 8 M FA aqueous solution for 6 hr. Slight degradation of Ir-bipyridine type catalysts was observed under these conditions. In the case of the catalysts with pyridylpyrazole ligands, the gas generation smoothly proceeded without any notable decrease in the reaction rate. The robust catalyst remained catalytically active for 35 days in FA dehydrogenation at 70 °C to produce hydrogen gas (1.25 m<sup>3</sup>) with a TON of 10 million with 4 M FA. We are working on further improvement of the catalysis with more refined designs of the catalysts.

Robust and efficient iridium catalysts having pyridylpyrazole ligands for dehydrogenation of formic acid

2019 Fall National Meeting

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